Steps

Transfer garlic butter to plastic wrap; form into a log shape and chill.

In large bowl, combine mayonnaise, egg, egg yolk, chives, mustard, seasoning and cayenne; mix well. Season with salt and pepper. Gently fold in crab and mix until lightly blended. Cover and chill until mixture is firm.

Make a small slit on the inside of each shrimp. Flip over and split open the back side of each shrimp, forming a pocket for stuffing, taking care not to cut all the way through.

Form chilled crab stuffing into balls; stuff evenly into each shrimp. Sprinkle breadcrumbs lightly over stuffed shrimp. Cover and chill to hold.